21212210022 has 32 divisors (see below), whose sum is σ = 43899256800. Its totient is φ = 6825063168.

The previous prime is 21212209951. The next prime is 21212210059. The reversal of 21212210022 is 22001221212.

It is a junction number, because it is equal to n+sod(n) for n = 21212209983 and 21212210010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 719304 + ... + 748212.

It is an arithmetic number, because the mean of its divisors is an integer number (1371851775).

Almost surely, 2^21212210022 is an apocalyptic number.

21212210022 is an abundant number, since it is smaller than the sum of its proper divisors (22687046778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212210022 is a wasteful number, since it uses less digits than its factorization.

21212210022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33160.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21212210022 its reverse (22001221212), we get a palindrome (43213431234).

The spelling of 21212210022 in words is "twenty-one billion, two hundred twelve million, two hundred ten thousand, twenty-two".